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That was what I was searching of earlier, the Yasuki steel which is made by Hitachi & is of high quality but the highest quality Tamahagane is the Top of the line like you said because it is used for...

I have found & read that the better ones are the ones with the Hitachi steel in them but there are others as well. Here's a link to some steel made in Japan. I will do some more searching. I'm...